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Table B - Extensions to an existing dwelling. All charges include VAT at the rate of 20% 

Domestic extensions

Charges
CategoryDescriptionPlan chargeInspection charge (IC)Building notice charge (BN)Regularisation charge (RG)Part P* additional IC, BN, RG Charge
1 Extension with floor area not exceeding 10m² £150 £200 £385 £385 £120
2 Extension with floor area exceeding 10m² but not exceeding 40m²  £150 £300 £495 £495 £120
3 Loft conversion up to 40m² £150 £200 £385 £385 £120
4 Loft conversion up to 40m² that includes a dormer window £150 £300 £495 £495 £120
5 Erection or extension of a detached or attached domestic garage or carport with floor area not exceeding 40m² £150 £100 £275 £275 £120
6 Erection or extension of a detached or attached domestic garage or carport with floor area exceeding 40m² but not exceeding 80m² £150 £200 £385 £385 £120
7 Conversion of a domestic garage to a habitable room(s) £150 £150 £330 £330 £120

* The Part P additional charge should be added when a person who is not a Part P registered electrician carries out notifiable electrical work.

Part P

Any notifiable fixed electrical installations which form part of your proposal should be carried out by a registered Part P electrician. If not, your application fee will be subject to an additional fee as indicated in the schedule above. For further information please contact the building control team|.
A Part P registered electrician is a qualified electrician who is registered under a government approved competent persons scheme. In order to recover the local authority costs the additional charge is payable if anyone other than a Part P registered electrician undertakes the electrical work.

Notes

1. The erection of a dormer window includes any works to raise the height of any part of the roof as part of the proposal. This includes changing a hipped rood to a gable or any works to increase the head height available by lifting the roof.